egleb



N. F. EGLER.

FURNACE.

APPLICATION mm mm 1, I919.

1,372,6 1 3. Patented Mar. 22, 1921.

3 SHEETS SHEET l.

N. F. EGLER.

FURNACE.

APPLICATION FILED MAR 1.1919.

1,372,613. Patented Mar. 22,1921.

3 SHEEIS -SHEEY 2.

INVENTOR N. F. EGLER.

FURNACE.

APPLICATION FILED MAR 1.1919.

1,372,61 3. Patented Mar. 22, 1921.

3 SHEETS SHEE! 3.

v V I UNITED STATES PATENT OFFICE.

NICKOLAS F. EGLER, OF CHICAGO, ILLINOIS, ASSIGNOR TO BLAIR ENGINEERING COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF NEW YORK.

FURNACE.

Specification of Letters Patent.

Patented Mar. 22, 1921.

Application filed March 1, 1919. Serial No. 280,056.

To a/Z whom it may concern:

Be it known that I, NICKOLAS F. EGLER, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented a new and useful Improvement in Furnaces, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming part of this specification, in which- Figure 1 is a longitudinal section through one form of furnace, showing one form of my improvement in connection therewith.

Fig. 2 is a horizontal section through the furnace.

Fig. 3 is a vertical section on the line 'III III of Fig. 1. and

Fig. I is a vertical horizontal section of one end of another form of furnace.

This invention relates to an improvement in furnaces and more particularly to reversing open hearth furnaces.

()ne of the objects of my invention is to provide a furnace in which the nose of the ports. roof or end walls will not be cut away by the flow of the gases when passing from the furnace to the checker work or regenerators, so that the life of the furnace is greatly increased.

1 accomplish this by providing auxiliary ports through which the gases pass when leaving the furnace. and preferably place these ports in front of and below the usual air and fuel ports so that the hot products of combustion will readily be carried off without directly contacting with the nose of the port or ports, or the end walls of the furnace.

The precise nature of my invention will be best understood by reference to the accompanying drawings in which I have shown several forms of furnaces. it being premised, however, that other forms of furnaces, as well as other forms of ports and valves, may be used without departing from the spirit and scope of my invention as defined in the ap ended claims.

Referring to igs. 1, 2 and 3, the reference character 2 designates the hearth of an open hearth furnace, 3 the air ports leading into the furnace from opposite ends. which air ports communicate with air flues 4 at each end of the furnace. 5 are valves connected to suitable lifting devices 6, there being one valve for each port 3, and T are ports or pipes for gas. oil or any suitable fuel at each end of the furnace. there being one communicating with each of the air ports 3. The air and gas are mixed in the air ports 3. the portions of the air ports 3 beyond the openings of the gas pipes T serving as mixing chambers. This arrangement is particularly useful when coke oven gas is employed. because coke oven gas is light and hard to control. The flow of gas through these pipes is controlled by any suitable valves such as 7 to supply the required amount of fuel. The air flue's 4 at each end of the furnace are each in communication by means of two vertical air flues 8 with a main air flue S) leading from a regenerator. not shown, but which may be of any well known construction. The upper end of each of the air fiues 9 is provided with an outlet port 10, which may be protected by means of a water cooling device 11 of any well known character. which may be supplied with water in any desired manner. Slidably mounted above each outlet port 10 is a valve or gate 12 which. in the construction shown is adapted to slide under an arch 13. through an opening in the side or front of the furnace. as clearly indiated in Fig. 2: although it will be readily understood by those familiar with the art that the valve may be of any suitable form and may be moved in any direction. in accordance with the requirements of the particular furnace to which my improvement is applied.

Then the furnace is in operation the. valve 12 on the one end is open, while the air valves 3 at this same end are closed. and the air valves at the other end. as well as the gas valves. are open to permit gas and air to flow into the furnace from one end over the hearth while the products of combustion pass out through the port 10 at the other end of the furnace. and from there through the flue 9 to the checker work. When the furnace is reversed the air and fuel valves at one end of the furnace are closed, while the valve 12 at this end is opened. and the air and fuel valves at the other end of the furnace are opened and the valve 12 closed, so as to reverse the flow through the furnace in the usual manner.

In Fig. 1 of the drawings air and gas are passing from the left hand end of the furnace over the hearth, while the products of combustion pass out through the right hand port 10 instead of through the air or gas ports, so that the products of combustion in their outward passage at the right hand end of the furnace will not cut away the nose of the ports, as in the well known Siemens type of furnace.

Since the hot products of combustion escape from the furnace through a port separate from the fuel and air inlet ports, the latter ports may be made of a finer construction than heretofore possible and may be distributecl along the end wall of the furnace. This permits the separate regulation of a plurality of air and fuel ports and permits a better controlled heat distribution in the furnace.

In Fig. 4 of the drawings I have shown another form of furnace, in which the air ports 3 communicate with an air flue 4, and 5 are valves for controlling the opening between the ports 3 and the flue 4. In this construction the fine 4 communicates with two vertical air flues 8 each of which communicates with an air flue 20, one on each side of an oiftake flue 21, which ofl'take flue communicates with one end of a hearth by means of a port 22. The offtake flues 21, one from each end of the furnace, are arranged to be put alternately into communication with an offtake flue in the usual manner by means of any of the well known types of reversing valves, when the furnace is reversed. This type of regenerator is commonly known as a recuperative rcgenerator or a recuperator. The expressions regenerator or regenerative system as used herein are intended as terms of description and not of limitation, and to include recuperators or any other type of air preheating device in which the incoming air is preheated by the products of combustion. In this construction there is also a "as )ort or he 7" communicating with each of the air ports 3.

It is not necessary, in this construction, to provide valves for closing the upper ends of the offtake ports 22, as the flow of the hot gases from the furnace is controlled by means of the usual reversing valve at the stack, or may be controlled in any other desired manner.

The advantages of my invention result from the provision of a regenerator furnace in which the products of combustion pass out through a secondary port to the regenerators, together with means for controlling the flow of the hot gases to these ports, whereby I am enabled to prevent the cutting away of the nose or noses of the inlet ports. Another advantage results from the provision of outlet ports so arranged with relation to the inlet ports, which will cause the hot gases to pass more directly in contact with the bath and also avoid the cutting away of the roof of the furnace, and the end walls thereof.

I claim:

1. An open-hearth furnace comprising, in combination, a hearth, a combined fuel and air port at each end of the furnace of relatively small width as compared with the hearth, regenerative chambers having communication with said ports, additional channels leading from the regenerative chambers to the interior of the furnace adjacent the ends thereof, and means for causing the entire air passing through the regenerative chamber at the inlet end of the furnace to pass through the combined fuel and air port.

2. An open-hearth furnace comprising, in combination, a hearth, a combined fuel and air port at each end of the furnace of relatively small width as compared with the hearth, regenerative chambers having communication with said ports, additional channels leading from the regenerative chamhers to the interior of the furnace adjacent the endsthereof, means for causing the entire air passing through the regenerative chamber at the inlet end of the furnace to pass through the combined fuel and air port, and means for preventing the flow of the products of combustion through the combined fuel and air port at the outlet end of the furnace and causing the same to pass through the additional channel into the rcgenerative chamber. I

3. An open-hearth furnace comprising, in combination, a hearth, a regenerative chamber at each end, a combined fuel and air port communicating with each end of the furnace of relatively small width as compared with the hearth, and with the respective regenerative chamber, additional channels connecting the regenerative chambers with the furnace adjacent the two ends, and a throttlevalve in each additional channel whereby wholly or partially to close the same and thus cause the substantial volume of regenerated air to pass through the combined gas and air port. I

4. An open-hearth furnace comprising, in combination, a hearth, a regenerative chamber at each end, a combined fuel and air port communicating with each end of the furnace of relatively small width as compared with the hearth, and with the respective regenerative chamber, additional channels connecting the regenerative chambers with the furnace adjacent the two ends, a throttle-valve in each additional channel whereby wholly or partially to close the same and thus cause the substantial volume of regenerated air to pass through the combined as and air port and a throttle valve in eacl combined fuel and air ort.

In testimony whereof, I have hereunto set my hand.

NICKOLAS F. EGLER.

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